Just to clarify:
1. Has your MP prepared/signed your invitation letter?
2. Notarization is not required.
That's right. Either you or your accountant (as your representative) can use Express NOA. You need to use a .EFILE or .NETFILE-certified tax software for this.
You can view your NOA immediately after CRA processes it. You will be able to view/print your Express NOA anytime and keep it in your records. CRA will not send you a paper print.
It is the same. You can submit this Express NOA for your parents super visas